Which Greek letter serves as the title of Darren Aronofsky's 1998 film about an eccentric math whiz?

Which Colorado ski town is named after a tree? A Greek chorus of mice sang and read the title cards of which 1995 film? Which word names both a Greek god and a shallow cooking vessel? A Greek-backed military coup in 1974 briefly deposed Archbishop Makarios, president of which island nation? Which "green" government agency is abbreviated EPA? A greenbottle is which type of insect? A greengage is a plum; a greening is what fruit? A Greyhound cocktail is vodka and which tart juice?